Good luck on the contest everyone!(if you are participating that is)

Lets hope people(like me) losing rating in Global round can gain positive delta in this round :)

Опечатка:

О стипендии:

➡ Работа в одном из самых интересных технологических городов Европы

➡ Размер стипендии до 31 500 евро.

➡ Компенсация за стажировку в OneRagtime (800 евро в месяц)

➡ Возможность работать в OneRagtime на полную ставку по окончанию ($$$- \gt $$$ окончании) обучения

[DELETED]

My chance to become specialist :-P

Such a long announcement

It would be very cool too see in future video editorial from the authors!

P.S Sorry for bad English.

Hope for green.

Is there any points system associated with educational rounds and how do successful/unsuccessful hacks affect the points system (if there is one), ranking and the rating?

Let's just hope that problem A isn't 2 lines of code while problem B requires 3 dimensional dynamic programming and you need to precalculate all the stock market crashes in the next 5 months.

I hope there are no adhoc/constructive/geometry/very mathy problems.

I wish higher problems had higher points :(

.

I have participated in 50 contests! Will i be CM before my 100th contest?

My Last brain cell during contest :/

Ahh life's too stressed ....wake up 12 in the noon pass the time learning algos till 7...then CP till 11 and then Counter Strike till 3 am ,sleep at 4:30 and repeat. I guess i messed up this lockdown .

I wish I can do well in this round!

Delayed by 10 minutes!

Well, it's delayed. Here we go again)

delayed by 10 minutes..duh

Delayed by 10 minutes :(

.

Delayed by 10 mins.Hope the contest to remain rated

10 more minutes

Contest has been delayed so I'm here because I don't know what to do with my life for the next 10 mins.

What ever the reason of delay is, I hope the contest doesn't become unrated again.

.

I just pray it don't go unrated.:(

why they extend time , it affects mindset of some coders ,what do u think guys ?

oh,a delayed contest may lead somthing unlucky and I hope the contest will go well.

10 more minutes of TWICE it is :D

I this 10 min I realize how useless I am ....

I this 10 min I realize how useless I am..

Hope to become cyan.

This type of Div 2 B demotivates me very much

Sadist is what you call the person who authored problem B.

bruteForces

I really hated this B because I tried to solve it the wrong way I guess

Some one please tell me about process of B i was trying since 1.5 h but i can't find a answer. Please help me to find out the answer

Can someone tell how to solve B

Gap between B and C was very huge , fucked up in the contest literally fucked up !!

ImplementationForces

UPD:

#include <iostream>
#include <vector>
#include <algorithm>

int max(std::vector<int>& a, std::vector<int>& b) {
    if(a.empty() || b.empty()) return 0;

    int ans, m = (int) b.size();
    std::vector<int> suff(m + 1);

    suff[m] = 0;
    for(int i = m - 1; i >= 0; i--) {
        auto it = std::lower_bound(a.begin(), a.end(), b[i]);
        if(it != a.end()) suff[i] = suff[i + 1] + (*it == b[i]);
        else suff[i] = suff[i + 1];
    }
    ans = suff[0];

    for(int i = 0; i < m; i++) {
        auto it = std::lower_bound(a.begin(), a.end(), b[i]);
        if(it == a.end() || *it > b[i]) it--;
        it = std::lower_bound(b.begin(), b.end(), b[i] + (int) (a.begin() - it) );
        ans = std::max(ans, suff[i + 1] + (int) (b.begin() + i - it + 1));
    }

    return ans;
}

int main() {
    std::ios_base::sync_with_stdio(0);
    std::cin.tie(0);

    int t, n, m, x;
    std::cin >> t;

    while(t--) {
        std::cin >> n >> m;
        std::vector<int> l, r, bl, br;

        for(int i = 0; i < n; i++) {
            std::cin >> x;
            if(x < 0) l.push_back(-x);
            else r.push_back(x);
        }

        for(int i = 0; i < m; i++) {
            std::cin >> x;
            if(x < 0) bl.push_back(-x);
            else br.push_back(x);
        }

        std::reverse(l.begin(), l.end());
        std::reverse(bl.begin(), bl.end());

        std::cout << max(l, bl) + max(r, br) << '\n';
    }
}

Really bad problems

For question D: https://mirror.codeforces.com/contest/1494/submission/108942229

Input

3
2 5 7
5 1 7
7 7 4

Participant's output

5
2 1 4 5 7 
4
1 4
2 4
3 5
4 5

Checker comment

wrong answer LCA of 1 and 3 is 4 and c[4]=5, but a[1][3]=7

I think the graph will be

5

4 3

1 2

So LCA of 1 and 3 is 5 but checker says it is 3. I don't understand why ? is there anything wrong with my output format ?

In problem B, you only need to check 4 corners, which is totally 16 situation, and just brute force all of them, If you use if else... if else..... you will probably get WA till the end.

My impression when i see the accepted on B after 1.44 hour continuous trying xD .. I am getting negative delta but still happy xD

I hope to become a potato now.